/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_PCM_RESAMPLE_HXX
#define MPD_PCM_RESAMPLE_HXX
#include "check.h"
#include "PcmBuffer.hxx"
#include <stdint.h>
#include <stddef.h>
#ifdef HAVE_LIBSAMPLERATE
#include <samplerate.h>
#endif
class Error;
/**
* This object is statically allocated (within another struct), and
* holds buffer allocations and the state for the resampler.
*/
struct PcmResampler {
#ifdef HAVE_LIBSAMPLERATE
SRC_STATE *state;
SRC_DATA data;
PcmBuffer in, out;
struct {
unsigned src_rate;
unsigned dest_rate;
unsigned channels;
} prev;
int error;
#endif
PcmBuffer buffer;
PcmResampler();
~PcmResampler();
/**
* @see pcm_convert_reset()
*/
void Reset();
/**
* Resamples 32 bit float data.
*
* @param channels the number of channels
* @param src_rate the source sample rate
* @param src the source PCM buffer
* @param src_size the size of #src in bytes
* @param dest_rate the requested destination sample rate
* @param dest_size_r returns the number of bytes of the destination buffer
* @return the destination buffer
*/
const float *ResampleFloat(unsigned channels, unsigned src_rate,
const float *src_buffer, size_t src_size,
unsigned dest_rate, size_t *dest_size_r,
Error &error_r);
/**
* Resamples 16 bit PCM data.
*
* @param channels the number of channels
* @param src_rate the source sample rate
* @param src the source PCM buffer
* @param src_size the size of #src in bytes
* @param dest_rate the requested destination sample rate
* @param dest_size_r returns the number of bytes of the destination buffer
* @return the destination buffer
*/
const int16_t *Resample16(unsigned channels, unsigned src_rate,
const int16_t *src_buffer, size_t src_size,
unsigned dest_rate, size_t *dest_size_r,
Error &error_r);
/**
* Resamples 32 bit PCM data.
*
* @param channels the number of channels
* @param src_rate the source sample rate
* @param src the source PCM buffer
* @param src_size the size of #src in bytes
* @param dest_rate the requested destination sample rate
* @param dest_size_r returns the number of bytes of the destination buffer
* @return the destination buffer
*/
const int32_t *Resample32(unsigned channels, unsigned src_rate,
const int32_t *src_buffer, size_t src_size,
unsigned dest_rate, size_t *dest_size_r,
Error &error_r);
/**
* Resamples 24 bit PCM data.
*
* @param channels the number of channels
* @param src_rate the source sample rate
* @param src the source PCM buffer
* @param src_size the size of #src in bytes
* @param dest_rate the requested destination sample rate
* @param dest_size_r returns the number of bytes of the destination buffer
* @return the destination buffer
*/
const int32_t *Resample24(unsigned channels, unsigned src_rate,
const int32_t *src_buffer, size_t src_size,
unsigned dest_rate, size_t *dest_size_r,
Error &error_r)
{
/* reuse the 32 bit code - the resampler code doesn't care if
the upper 8 bits are actually used */
return Resample32(channels, src_rate, src_buffer, src_size,
dest_rate, dest_size_r, error_r);
}
};
bool
pcm_resample_global_init(Error &error);
#endif
